jQuery(document).ready(function(){
    jQuery('#main_menu .parent').hover(
        function(){
            var current = jQuery(this).children('.subNavi');
            current.fadeIn();
            current.children('li').hover(
                function(){
                    jQuery(this).children('.subNavi').fadeIn();
                },
                function(){
                    jQuery(this).children('.subNavi').fadeOut();
                }
            );
        },
        function(){
            var current = jQuery(this).children('.subNavi');
            current.fadeOut();             
        });               
});